Suppose you have to determine the percentage of carbon dioxide in a sample of gas available in a container. Which among the following is the best absorbing material for carbon dioxide?

Heated copper oxide

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Cold, solid calcium chloride

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Cold, solid calcium hydroxide

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Heated charcoal

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Solution

The correct option is C
Cold, solid calcium hydroxide

$C O_{2}$ is an acidic oxide and thus more effectively absorbed by an alkali. Therefore cold solid calcium hydroxide is the best absorbing material for the carbon dioxide.

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